John Deere stx38 - Manual (Page 50)

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4/23/97
TESTS AND ADJUSTMENTS ENGINE
TESTS AND ADJUSTMENTS
THROTTLE CABLE ADJUSTMENT
Reason:
To make sure the throttle cable moves the throttle and
choke control lever through its full range of movement.
Equipment:
• 6.4 mm (0.25 in.) Drill Bit
Procedure:
1. Move throttle lever to FAST idle position.
2. Align hole in throttle control lever with hole (A) in
throttle control plate. Put a 6.4 mm (0.25-in.) drill
bit through holes to keep the throttle control lever
from moving. Be sure drill bit is perpendicular to
the throttle control plate.
3. Loosen cap screw (B) and pull throttle cable
housing tight. Tighten cap screw.
4. Remove drill bit.
5. Move throttle lever to the full choke position. Make
sure throttle lever is held up against throttle plate.
Choke should be fully closed.
6. Move throttle lever through full range to be sure
linkage is not binding.
CHOKE ADJUSTMENT
Reason:
To make sure the choke plate is fully closed when the
throttle lever is in the full choke position. Correct
adjustment also makes sure choke is completely open
in the fast idle position.
Equipment:
• 6.4 mm (0.25 in.) Drill Bit
Procedure:
NOTE: Adjust throttle cable before adjusting choke.
1. Move throttle lever to CHOKE position then back to
FAST idle position.
2. Align hole in throttle control lever with hole in
throttle control plate. Put a 6.4 mm (0.25 in.) drill
bit (C) through holes to keep the throttle control
lever from moving. Be sure drill bit is perpendicular
to the throttle control plate.
3. Turn screw (A) counterclockwise until screw does
not contact the choke control lever (B).
4. Turn screw clockwise until screw just touches the
choke control lever.
5. Remove drill bit.
6. Move throttle lever to full choke position.
7. Try to move choke rod (D) forward (choke rod
should not move). If the choke rod moves forward,
the choke plate is not fully closed. Carefully bend
the choke rod at Vee bend (E) until the choke plate
is fully closed.
8. Move throttle lever to be sure choke linkage is not
binding.
A
B
M55933
M55933
C
B
E
A
D